<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>数据统计</el-breadcrumb-item>
      <el-breadcrumb-item>数据报表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->  
    <el-card>
      <!-- 2.为ECharts准备一个具备大小（宽高）的Dom -->
      <div id="main" style="width: 700px;height:400px;"></div>
    </el-card>
  </div>
</template>

<script>
 // 1.导入 echarts
 import echarts from 'echarts'
 import _ from 'lodash'
  export default{
    name: '',
    data () {
      return {
        // 需要合并的数据
        options: {
          title: {
            text: '用户来源'
          },
          tooltip: {
            trigger: 'axis',
            axisPointer: {
              type: 'cross',
              label: {
                backgroundColor: '#E9EEF3'
              }
            }
          },
          grid: {
            left: '3%',
            right: '4%',
            bottom: '3%',
            containLabel: true
          },
          xAxis: [
            {
              boundaryGap: false
            }
          ],
          yAxis: [
            {
              type: 'value'
            }
          ]
        }
      }
    },
    created() {},
    // 此时,页面上的元素已经被渲染完毕了!
    async mounted() {
      //  3.基于准备好的dom，初始化echarts实例
      var myChart = echarts.init(document.getElementById('main'))

      const {data: res} = await this.$http.get('reports/type/1')
      if(res.meta.status !== 200){
        return this.$message.error('获取折线图数据失败!')
      }
 
      // 4.准备数据的配置项
      const result = _.merge(res.data, this.options)
      // 5. 展示数据
      myChart.setOption(result)
    },
    methods: {}
  }
</script>

<style scoped>

</style>
